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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78daabd6abf97c1c55bdd1ad03aec0e02aedc923730fb1d9130e41ad2ea1dec1' 
  AND token = 'CE84/56MtwQYVP8BNBPjUDp57L6412sqWgcqSvun4cM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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