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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5187bb38e975e2992bac0680c0b51eb362de47a81a4a5e0608438755dbfa89b2' 
  AND token = 'f21CcBf3/scgV57ionkWsX1Q+tCm3+ZcMJLUJn2H11A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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