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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9e605604ec8cc99ed375e45a5652a80b14a860e1b85e18ea818e2c383604f87' 
  AND token = 'lMfKobpA33HP+FWuAQIjI6+z21X0NwNLU8+LzOghWbs=' 
  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"
    }
  }
}