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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4a768e56d0dbf360adca38ac9301b12ca5aab785edcc5dc17f934cfeca8a5ef' 
  AND token = '6M2MG/4hqbj2RllDrHkV88NTRcXtaW0PPPgum2D2A1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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