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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72890e484931e25307e147d80e8532c6b98f3356bcda07ed6e8cc6786d21144f' 
  AND token = 'LNa2Z4qZp6F2bnZe2abFJGRhJc6P0PMgATJlUOUXZhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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