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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ecff54a899ec8689ae53f36ae3865c715d7378c1de97ad4d41c79b8c7e14a5a' 
  AND token = 'BWaPsNyPmy8wDvd0alJLeu/2NO3JVp9RCQ/KDRLB3+A=' 
  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"
    }
  }
}