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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '460b2ac5cbd33a04afa438e7b996666aca7cb3e22f386e5db960389ded50b8f8' 
  AND token = 'je5j+y9ZbF6TUiEV71p68ffhaQ//xXRw90b3lv4jPM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}