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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '179703fdd79bd55e917481b0dd4a9d8601feed5ce547657c6491db0faee4b6b1' 
  AND token = 'BDfVnSQjcq/bE86iAE4HsM7vul65n+uAaKayBstfpVE=' 
  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"
    }
  }
}