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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a24dacf17379490fee4a78dc6957bfaf4775e43bf44ebb3ad35ffb6e86b8c6d' 
  AND token = 'w8r1Na8CexyI7bI16u5KqLO6GHewNilNBMEmL0RD3q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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