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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3997214b00b6f2316950c53c7fbfd0d77ef128c5ca8bae3a8b9cebce31fb339f' 
  AND token = 'PY1VdpwczQeUoLKve+JF9x5ofVAyByj3wUfouSh2pco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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