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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a3f317059ecf6bb4c05fefa35c82d383a7a38c2742fb0a969a0d97e15d4f8c7' 
  AND token = 'nETWA24e+DhCXHdVz2/xMy94/JjwEQZElsPjmQEQ09c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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