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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f26eb54fd9a021988515835270369f35ee9c66cbb407eace596935f0e64ecdb' 
  AND token = '7AIYDR4Fn0sDriAYebOaiabaqiupBWSEE/EGM87Dk3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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