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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aa3968f5f4211ef8fd19229b8f6e93def250a872838b8e6f47583dcfaccdc42' 
  AND token = 'L6kS2amIBM79Lv8r2JQevjBbyc1YKo9vmI7Rb/49uaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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