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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c1221815908ad666cb303988bd9aedba869c99f72d05bd4a19e0324487f59e8' 
  AND token = 'nK2LbAIy+ib6Bbni4D2n0icLw4sLoqvPmSUKB1wzR7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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