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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16585e9c20ea8ba3694439f24c9ccde02c8cefce42fa283e972ba7551c5a6cba' 
  AND token = 'FPjbMq3McB1whHSEirEtm8I+aRvapAcYZ+jP7jmT6aw=' 
  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"
    }
  }
}