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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a712f9dd145e7f425bd5b1d6b00dbc0a1ba74e434700d949ea8928155bae0de9' 
  AND token = '4MOOxSwYS+6ukAiO8jNU9aHGCsBAGVQ9lKU3o0Td4IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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