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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c70ddd797b7d8f723acdfd3e162d054ede6f00c430ee5267a9a0f362032e2cd' 
  AND token = 'uMs9LwbD2CFomUgA+eQdTdV5uYZvaYlNcE4IIRDs+9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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