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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f7db8bf1395ec4a5659f7fa7c31c892445981e4b2795258134b3ca33bf2b67' 
  AND token = 'tW1eVFYDpeR2yXhOFQ/fiDoZW2Z5k+b6R+NJ3gQJ8W4=' 
  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"
    }
  }
}