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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'badd5bf8c9e9466505450f9f036655736ac56ebe12c090d4f3d308ff7c9152a0' 
  AND token = 'jdWONTrtoqpoqS+xEP1HVvcKdmTf90THVCSor3gW34Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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