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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b83a13605f8e57d1045a6969494d96cea1f92b4e676e338fe647c3454fd2b175' 
  AND token = '51ksSMcb7vYnAfdXPVpWX21T26SqRgs77YRD7ejpf0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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