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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4e7c80449038b8f898c013f45e4d5f3d06dc67fbd29e6d4e31ec4ba9d7f1b71' 
  AND token = 'xzI6GLIHz1I1s+gCxbRhgRs0b3cWTQXSCBA3odhd+Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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