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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a9870f9e28810690b8ece5c3b920e207cc14a2c3fedb65aee081dc5910bfddf' 
  AND token = 'eUrbKcyX3A7XpYxh+6zjKWpZYzCNQ9Mfug1p1ls343s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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