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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '507d93571b5b22688b00d5fed8e037a5beebef49397df9e0e0f3b08e44b4e9c1' 
  AND token = 's0gWlNOlbEDk2l0/aTAWbHY+NOOi+K86tppimEb2bWE=' 
  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"
    }
  }
}