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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af8f72c531727d65fb06d76a2c302dd6d843446f4a45d058172c15b588962f21' 
  AND token = 'pHkfgE6mMo35CPYkJScmAhuhSA0GDofKlKsnnQjILJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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