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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38b2602bec054ba662163295b49b26df67839bd1966c7916962edee860683c6f' 
  AND token = 'CnJ2fmnJUmwIH69n1Dptf14vjB9HMtvElA65c5zLRak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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