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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c03a2de20e50e42cf38e68f1b17a440844702e17e5e423af2a27dc5d5945b5' 
  AND token = 'OLv+b0Fl2l/w/+FFYh0bG5hnaQrChlp72eEubV9LqXc=' 
  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"
    }
  }
}