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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1d20668a7279201a8ccac942307161d17598a2ef7755651c653532e3f4cab1' 
  AND token = 'DX5HN/nUk9o1b1C6aCL4NYMbfjxHQhpEcNVG/WsYJL0=' 
  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"
    }
  }
}