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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ac2990a691bb62b27d6d28b0c1223a23f3a84a7aa1c38c7bbf2d3cfb327c97' 
  AND token = 'iJqzN7BxNCu1PGlY/nHkZC/9K8G+Y687kbVQMeA57e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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