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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52441ab10b3a0081ac02c1590dc3496a9f2ddb4eaa85cb9c05ed70fd175c8f6e' 
  AND token = 'kSIOpEjgyttlD6gZuvmAGAirA7BAmg4g1VRIxi2AL0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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