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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0fd725eada522a067c5dae453b8b0e68cc51ecb426fb5d99df45d7d18d4aaf8' 
  AND token = 'eQgV/8+kjBbEEpKi2/53DQogcFSWN4X6e0t3xsFUQsM=' 
  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"
    }
  }
}