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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90eec4b4d2104f88893d0a0ffa2e4b5cade72da50993652c1039c6ac9208a7b4' 
  AND token = '/9vq5xw7aXPAE0sxkEVCYYXDrTZ0y9e/axWopZS8CzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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