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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f717402f6b32ec018ebe385889c67950cd471ba0f1aeab4db280a539a883f231' 
  AND token = 'NkdA2+/TSwPgute7BDFgfgZZKx2x+HWoL6DE/rFrGxE=' 
  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"
    }
  }
}