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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd37be6f9b6b63e1ce11908500ef9a71b97b16bc2d302494b50cb307f670fbb61' 
  AND token = 'XpcvsHSADMg1eBj4vO/Kje3s8MOzcCyPoOj2zlzNeS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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