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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9f084804e2c38b067ef4e372a49652af17b9250d798ddce752077fe8fff1461' 
  AND token = 'z4V75jzjdJf1RsGGqd0HutQpMaOVy6F3zf2UHVMpvUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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