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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c04350105273a03322ac4e9f382a92de0da4e71856f90b58ed91da2667125c75' 
  AND token = 'w31cmGdGiKlu1CgcVa//QozQBx0KfV3QCyJx9ghy+oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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