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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '553ba6fe7e78dcdf8354db84f5ff001b5800780ad8894213e1ffd52a8718187c' 
  AND token = '4m4m3vX+LHBVRyN6uooX7+KrNsWHjIj0BfgtjDVICVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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