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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b1432a80a3045e465744aeed7183c1d6264dc1bf6343e4ed5dca9b52e67803' 
  AND token = 'e+P+oa51c+1t7+h97Uh1ELRLhiosK27Cv9C2WEfZzO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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