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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fbd5e1454e66b3708a2c5a0c33ec53c28a871c0ada648930641b476bd00bf2d' 
  AND token = 'cA7UtFESd8/1nVkI0gfQDBTG4+6rjNhnvrscw8yCMqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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