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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e36642fce862f7af8ef1db6f06162a58804a7aafff121f53a8d8bf6805854f2b' 
  AND token = 'esh7lhPA7XowJPORSCe6pgJN7Y5yubriIWrFrEXWT+w=' 
  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"
    }
  }
}