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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd16ca0509bf5a2a9e8a03b2f9b1b935c2574b6a13d6727a22d262bc6170a07e' 
  AND token = '60P7YkcxsILXBikAK3PlzcaKt2LfZhsyAmku1o5RuiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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