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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76bd310d65c89a1e33cfdda85c468fc176f269f2948708a7c6c22952a0a22bd6' 
  AND token = 'HomFRJ3F0mlIx1dPOMw0n6Mx8rm7l0TY/8rigcoXj9Q=' 
  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"
    }
  }
}