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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da76455a1c3a26aa3c449c4c487e90eefd8e678625677e13b63c1a4ea3f45f6b' 
  AND token = 'wIYWfUe/OFHLj+rOiU3eI/60I3ZNXUbfXRsf01TKE/E=' 
  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"
    }
  }
}