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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937304d630b6a317ee99863c5ae8e77ae2d12a5d2d736114438a83e0616a7d6b' 
  AND token = 'XPPftdmF5VI95MH8FjZg9oO02LZCuq9PDuJFFd1vDWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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