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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d627220f0d271bdb29b14a03c8b4013eaab49b7affd704176f2c460c16740a2' 
  AND token = '5unoJEdFNqR36y55YIr8OSTLPXHq8QYWjC1QzftrmnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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