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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ed933e5d0159aac844ba8957a0bd86f37b675af75472376463d7ef57d30e1d' 
  AND token = 'R2L5fpQall2vEivNy1quTH+H5anDKvj2AkTTHYiNeFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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