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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82176d4cb070b25341f97f8aa1c29da0d45255b9dbd0b3d008010ee36b367aa' 
  AND token = 'ERlPY4jOPfzNsm1gPtEolVbjLv9T8lEETYccfXyH9vo=' 
  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"
    }
  }
}