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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '176922e0b0e79363a4de95ef5b30fca79114d690276584d0838ab4e4ce30f47a' 
  AND token = 'KTm7BfKMbT5POXcs7VT9M1fMXjeoSL2nHF6sRVYAUpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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