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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '248f0de3e25e83cc42fff7861717a515de1db23ec3f7e5305ce89c27b2a33824' 
  AND token = 'haNOkN+TA5CxFPGcqyqUr+fm8cNkghT/vKhpXhSWsfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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