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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2285926187b5271a2d08ba9c045d20c1c6f0f7d72481c0c670c1802cccd2be84' 
  AND token = '30MdLMyUwIZs91/gCNSRF0AZ0OHMbOsTs4Lhvrz1n04=' 
  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"
    }
  }
}